我正在制作一个简单的游戏作为一个项目，需要改变我的鸟类图像＆＃39;当它与另一个＆＃39;图像碰撞时
现在我已经设置了碰撞检测，我只需要改变我的鸟类图像的纹理＆＃39;到我的新形象
有关如何执行此操作的任何提示？我是编程新手，认为这很容易，但显然不是......
我尝试过更改
var birdTexture = SKTexture(imageNamed: "bird_img_1.png") // global variable
到
birdTexture = SKTexture(imageNamed: "bird_img_dead.png") // this is inside collision detection
GameScene类： -
import SpriteKit
class GameScene: SKScene, SKPhysicsContactDelegate {
var bg = SKSpriteNode() // Create Background
var bird = SKSpriteNode() // Create User Bird
var scoreLabel = SKLabelNode() // Create Score Label
var score: Int = 0 // Create Score Integer
var enemyBird = SKSpriteNode() // Create Enemy Bird
var birdGroup:UInt32 = 1 // Bird Collision Group
var objectGroup:UInt32 = 2 // Enemy Collision Group
var scoreGroup:UInt32 = 3 // Score Collision Group
var gameOver = 0 // Game Over function
var movingObjects = SKNode() // ??
var scoreTimer = NSTimer() // Create Score Timer
var gameOverLabel = SKLabelNode() // Game over label
var labelHolder = SKSpriteNode() // Holds Label - Game Over
var enemySpawnTimer = NSTimer() // Starts Enemy Spawner
var Menu = 0
/* Put Bird in and animate */
var birdTexture = SKTexture(imageNamed: "bird_img_1.png")
var birdTexture2 = SKTexture(imageNamed: "bird_img_2.png")
var birdTexture3 = SKTexture(imageNamed: "bird_img_3.png")
var birdTexture4 = SKTexture(imageNamed: "bird_img_4.png")
var birdDeadTexture = SKTexture(imageNamed: "bird_img_dead.png")
/* ------------------------------------ Main Setup ------------------------------------------ */
override func didMoveToView(view: SKView) {
/* Setup your scene here */
println("Moved to Game Scene")
movingObjects.speed = 0
/* Background Image setup */
backgroundImage()
/* Set up deletates and physics and timer */
self.physicsWorld.contactDelegate = self
self.physicsWorld.gravity = CGVectorMake(0, -5)
self.addChild(movingObjects)
self.addChild(labelHolder)
/* Load Score Text */
scoreLabel.fontName = "Helvetica"
scoreLabel.fontSize = 60
scoreLabel.text = "0"
scoreLabel.position = CGPoint(x: CGRectGetMidX(self.frame), y: CGRectGetMidY(self.frame)+self.frame.size.height*0.3)
self.addChild(scoreLabel)
bird = SKSpriteNode(texture: birdTexture)
bird.position = CGPoint(x: CGRectGetMidX(self.frame), y: CGRectGetMidY(self.frame))
// Make bird smaller
bird.size.height = bird.size.width/12
bird.size.width = bird.size.width/12
// Animate Bird
var animation = SKAction.animateWithTextures([birdTexture, birdTexture2, birdTexture3, birdTexture4], timePerFrame: 0.08)
var makeBirdFlap = SKAction.repeatActionForever(animation)
bird.runAction(makeBirdFlap)
// Load Physics
// birdPhysics()
// Run bird animation
bird.zPosition = 10
self.addChild(bird)
/* Introduce ground and top into the scene */
// Create Ground
var ground = SKSpriteNode()
ground.position = CGPointMake(CGRectGetMidX(self.frame), self.frame.size.height/100 * 16)
ground.physicsBody = SKPhysicsBody(rectangleOfSize: CGSizeMake(self.frame.size.width, 1))
ground.physicsBody?.dynamic = false
ground.physicsBody?.categoryBitMask = objectGroup
// Add Ground to scene
self.addChild(ground)
// Create Top
var top = SKSpriteNode()
top.position = CGPointMake(0, self.frame.size.height)
top.physicsBody = SKPhysicsBody(rectangleOfSize: CGSizeMake(self.frame.size.width, 1))
top.physicsBody?.dynamic = false
top.physicsBody?.categoryBitMask = objectGroup
// Add Top to scene
self.addChild(top)
}
/* ------------------------------------ Spawning Enemy Birds ------------------------------------------ */
/* Create and Spawn enemy birds */
func enemySpawn() {
let height = self.frame.size.height // screen height as variable
let width = self.frame.size.width // screen width as variable
var bottomBarHeight = self.frame.size.height*0.16 // bottom bar height
var spawningPoint = height - bottomBarHeight // screen height - 16%
var randSpawn = arc4random_uniform(UInt32(spawningPoint)) // random number between 0 and 645
var finalSpawn = CGFloat(randSpawn) + bottomBarHeight // add 16% (bottombarheight to the random number
/*
CHECK VALUES OF SPAWN
println("\(height) is the total screen height")
println("\(bottomBarHeight) is the pixels below the ground")
println("\(spawningPoint) is the random range")
println("\(randSpawn) is a random number")
println("\(finalSpawn) - Spawn Location")
println(enemyBird.position)
*/
if (enemyBird.position.y > 730) {
enemyBird.position.y = 720
}
if (enemyBird.position.y < 130) {
enemyBird.position.y = 135
}
// println(Int(enemyBird.position.y))
// Create enemy bird
var enemyBirdTexture = SKTexture(imageNamed: "enemy_img_2.png")
enemyBird = SKSpriteNode(texture: enemyBirdTexture)
enemyBird.position = CGPoint(x: CGRectGetMidX(self.frame)*2.5, y: finalSpawn)
enemyBird.size.height = enemyBird.size.height/12
enemyBird.size.width = enemyBird.size.width/12
enemyBird.physicsBody = SKPhysicsBody(rectangleOfSize: CGSizeMake(enemyBird.size.width, enemyBird.size.height))
enemyBird.physicsBody?.dynamic = false
enemyBird.physicsBody?.categoryBitMask = objectGroup
// Move enemy birds
var moveEnemyBird = SKAction.moveByX(-self.frame.size.width * 2, y: 0, duration: NSTimeInterval(self.frame.size.width / 100)) //4.14 seconds on screen
var removeEnemyBird = SKAction.removeFromParent()
var moveAndRemoveEnemyBird = SKAction.sequence([moveEnemyBird, removeEnemyBird])
// Add enemy to scene and move enemy
enemyBird.runAction(moveEnemyBird)
movingObjects.addChild(enemyBird)
}
/* ------------------------------------ Other Parts ------------------------------------------ */
func backgroundImage() {
/* Put Background Image In */
// Create Background Texture
var bgTexture = SKTexture(imageNamed: "bg.png")
// Link bg variable to texture
bg = SKSpriteNode(texture: bgTexture)
// Position thr bg image
bg.position = CGPoint(x: CGRectGetMidX(self.frame), y: self.frame.height/2)
bg.size.height = self.frame.height
// Move background image left
var moveBg = SKAction.moveByX(-bgTexture.size().width, y: 0, duration: 9)
var replaceBg = SKAction.moveByX(bgTexture.size().width, y: 0, duration: 0)
var moveBgForever = SKAction.repeatActionForever(SKAction.sequence([moveBg, replaceBg]))
// Keep world never ending
for var i:CGFloat = 0; i < 3; i++ {
// Position Background
bg = SKSpriteNode(texture: bgTexture)
bg.position = CGPoint(x: bgTexture.size().width/2 + bgTexture.size().width * i, y: CGRectGetMidY(self.frame))
// Stretch background full height of screen
bg.size.height = self.frame.height
// Run the action to move BG
bg.runAction(moveBgForever)
self.addChild(bg)
}
}
func startTimers() {
/* Create Score Timer */
//scoreTimer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector:Selector("scoreCount"), userInfo: nil, repeats: true)
enemySpawnTimer = NSTimer.scheduledTimerWithTimeInterval(0.75, target: self, selector: Selector("enemySpawn"), userInfo: nil, repeats: true)
}
func birdPhysics() {
/* Give bird physics */
// Give bird physics
bird.physicsBody = SKPhysicsBody(circleOfRadius: bird.size.height/3)
bird.physicsBody?.mass = 0.2
bird.physicsBody?.dynamic = true
bird.physicsBody?.allowsRotation = false
bird.physicsBody?.categoryBitMask = birdGroup
bird.physicsBody?.collisionBitMask = objectGroup
bird.physicsBody?.contactTestBitMask = objectGroup
}
func didBeginContact(contact: SKPhysicsContact) {
if contact.bodyA.categoryBitMask == objectGroup || contact.bodyB.categoryBitMask == objectGroup {
scoreTimer.invalidate()
enemySpawnTimer.invalidate()
bird = SKSpriteNode(texture: birdDeadTexture)
if gameOver == 0 {
movingObjects.speed = 0
gameOver = 1
movingObjects.removeAllChildren()// Remove all enemies
gameOverLabel.fontName = "Helvetica"
gameOverLabel.fontSize = 25
gameOverLabel.text = "Tap to retry!"
gameOverLabel.position = CGPoint(x: CGRectGetMidX(self.frame), y: CGRectGetMidY(self.frame)*1.5)
labelHolder.addChild(gameOverLabel)
gameOverLabel.zPosition = 9
}
}
}
override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
/* Called when a touch begins */
if (Menu == 0) {
movingObjects.speed = 1
birdPhysics()
startTimers()
}
if (gameOver == 0) { // Runs if game is not over
bird.physicsBody?.velocity = CGVectorMake(0, 0)
bird.physicsBody?.applyImpulse(CGVectorMake(0, 80))
Menu = 1 // Number on right is jump height
} else { // Runs if game is over
score = 0 // Score int is 0
scoreLabel.text = "0" // Score Label is 0
bird.position = CGPoint(x: CGRectGetMidX(self.frame), y: CGRectGetMidY(self.frame)) // Position Bird in center
bird.physicsBody?.velocity = CGVectorMake(0,0) // Cannot make bird jump
labelHolder.removeAllChildren() // Removes all labels
gameOver = 0 // Sets game over to 0 so game will run
movingObjects.speed = 1
startTimers()
}
}
override func update(currentTime: CFTimeInterval) {
/* Called before each frame is rendered */
}
}
答案 0 :(得分：2)
您只需更改SKSpriteNode的纹理，
sprite.texture = newTexture
在游戏开始前加载纹理。
var birdAliveTexture = SKTexture(imageNamed: "bird_img_1.png")
var birdDeadTexture = SKTexture(imageNamed: "bird_img_dead.png")
var bird : SKSpriteNode!
加载精灵时，给birdSprite命名。
bird = SKSpriteNode(texture: birdAliveTexture)
bird.name = "bird"
在didBeginContact函数
func didBeginContact(contact: SKPhysicsContact) {
if contact.bodyA.categoryBitMask == objectGroup || contact.bodyB.categoryBitMask == objectGroup {
scoreTimer.invalidate()
enemySpawnTimer.invalidate()
bird.removeAllActions() //changed
bird.texture = birdDeadTexture // changed
if gameOver == 0 {
movingObjects.speed = 0
gameOver = 1
movingObjects.removeAllChildren()// Remove all enemies
gameOverLabel.fontName = "Helvetica"
gameOverLabel.fontSize = 25
gameOverLabel.text = "Tap to retry!"
gameOverLabel.position = CGPoint(x: CGRectGetMidX(self.frame), y: CGRectGetMidY(self.frame)*1.5)
labelHolder.addChild(gameOverLabel)
gameOverLabel.zPosition = 9
}
}
}